What is the poem on the vast and distant frontier described by Wang Wei in the poem "Going to the Frontier"?

The desert is lonely and straight, and the long river sets the yen.

Go to the frontier to carry out tasks

Bike wants to ask questions, and it is a country that has lived for a long time.

When the account is collected, the geese return to the lake field.

The desert is lonely and straight, and the long river sets the yen.

Xiao Guan always protects Ran Yan when he rides a horse.